Driving and stopping mechanisms



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July 30, 1940. o. R. HAAS DRIVING AND STOPPING MECHANISMS Filed Feb. 25,1953 8 Sheets-Sheet 2 July 30, 1940. Q R HAAS 2,209,455

DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1958 8 Sheets-Sheet 3July 30, 1940. o. R. HAAS DRIVING AND STOPPING MECHANISMS Filed Feb. 25,1938 July'30, 1940. o. R. HAAS DRIVING AND STOPPING MECHANISMS 8Sheets-Sheet 5 Filed Feb. 25, 1939 July 30, 1940. O R HAAS 2,209,455

DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1938 8 Sheets-Sheet 6July 30, 1940. o. R. HAAS 2.209,455

muvme AND STOPPING MECHANISMS Filed Feb. 25, 1938 8 Sheets-Sheet 7 5123330, 19 o. R. HAAS DRIVING AND STOPPING MECHANISMS Filed Feb. 25, 1938 8Sheets-Sheet 8 L n L a a5 )1 I l A92 I fia/enwr Wnesa Patented July 30,1940 2,209,455 'pmvnve AND s'rorrme MECHANISMS Otto R. Haas, NorthBeverly, Mass., assignor to United Shoe Machinery Corporation, Boroughg! Flemington, N. J., a corporation of New ersey Application February25, 1938, Serial No. 192,445 24 Claims. (Cl. 112-219) UNITED STATESPATENT OFFICE The present invention relates to shoe sewing machines; andmore particularly to improvements in a sewing machine of the typeillustrated and described in inventors co-pending application for U. S.Letters PatentSerial ,No. 76,924, filed April 29, 1936, uponwhichPatentNo; 2,148,197 issued February 21, 1939, having stitchformingdevices and driving andstopping mechanisms under the control of amanually operated foot treadle for either starting or stopping thestitch forming devices. 1

Shoe sewing machines in present commercial use in which the shoe ispresented to a machine while held in the hands of the operator arearranged to be under constant control of the operator while sewing andto be brought to rest by the operator when a seam is completed, or atother times when the stitch forming devices operate improperly.Ordinarily. a shoe sewing machine is started by pressure of theoperators foot on a control treadle and, when the machine is to bestopped, the pressure is released; In machines designed to operate atspeeds much higher than ordinary, such as in the machine illustrated inthe application above referred to, a number of cycles of operation maytake place between the instant at which an improper operation occurs,and the time at whichthepressure on the foot treadle is relieved. One ormore further operations also take place while the machine is' beingstopped by the driving and stopping mechanisms. Unless the operator isexceptionally alert to breakage of thread, or to other improperoperation, an excessive number of needle or awl perforations may be madein the work or the stitch forming devices may be damaged before theoperator detects the difficulty. After the machine is stopped and againmade ready for proper operation, the usual practice is to start themachine regardless of the alignment of perforations previously made inthe work with the new work penetrating movements of the needle or awl,and as a result, the workalong a substantial proportion of the seam isweakened by additional perforations, and rendered unsightly inappearance. I

The objects of the present invention are to provide a novel and improvedhigh speed shoe sewing machine of the type indicated in which auniformly satisfactory seam is more easily formed than heretofore and inwhich the diiliculties referred to are avoided, and more particularlyfor preventing an excessive number of stitching cycles of the machinebetween the occurrence of an improper operation and the time the machinecomes to a full stop so that full attention of the operator may bedirected towards properly presenting the work to the machine.

In the machine disclosed in the inventors patent heretofore referred to,a thread cutter is provided, acting whenever the machine stops to severthe thread by cutting beneath the surface of the work. If for any reasonit is necessary to stop that machine before the seam is completed, the

thread may be severed and the surface of the work unnecessarily injuredat an intermediate position in the completed seam. Thus, an additionalinjury may be made at the surface of the work. A further object of thepresent invention is to provide a thread cutter for a manuallycontrolled shoe sewing machine arranged to operate only at the end of acompleted seam, and to be held inoperative at all intermediate positionsin a seam where the machine is likely to be stopped by reason of animproper stitching operation.

With these and other objects in view, the present invention relates tothe provision in a shoe sewing machine having stitch forming devicesactuated through driving and stopping mechanisms under control of amanually operated foot treadle, of means acting automatically as soon asan improper stitch is made to prevent continued and unnecessary injuryto the work, even though the operator fails to observe the difliculty.In the present embodiment of this feature of the invention, the stitchforming devices are stopped when the tension on the sewing thread failsto draw the auxiliary take-up to one side, as in regular sewing, and thetreadle and the driving and stopping mechanisms are immediatelydisconnected.

The machine hereinafter described is also equipped with a thread cuttersimilar to that of the application referred to, acting automaticallywhen the machine is stopped to sever the sewing thread, but means areprovided it the present machine for preventing actuation of the threadcutter when the treadle is held depressed so that if the machine isstopped before the end of a seam is reached by disconnection of thetreadle and the driving and stopping mechanisms, the sewing may berestarted without break in the thread after suitable adjustments aremade. While this feature is particularly applicable to use with thenovel features of the control means for stopping upon failure oftension, it is not necessarily limited to such use, but is advantageouswhen applied to any sewing machine having treadle controlled driving andstopping mechanisms and an automatically actuated thread cutter, inwhich the driving and stopping mechanism may be controlled to stopsewing by. means other than release of the treadle.

Another feature of the invention relating to the auxiliary take-up whichis also of general application to any sewing machine with or without athread cutter, contemplates the provision of novel and improved meansfor causing the auxiliary take-up not only to maintain a yieldingtension on the thread during sewing, but also to take up yieldingly andto hold within the machine at the end of a seam an extra length ofthread for use in the first stitch of a new seam so as to preventbreakage or waste of thread in restarting the machine.

Other features of the invention include certain devices, combinationsand arrangements of parts hereinafter described and. claimed, theadvantages of which will be readily understood by one skilled in the artfrom the following description taken in connection with the accompanyingdrawings in which Figure 1 is a view in front elevation, partly brokenaway and in section of the upper portion of a sewing machine embodyingthe features of the present invention, and illustrating the actuatingparts in stopped positions; Figure 2 is a view in side elevation of themachine with parts partly broken away, as viewed from the right ofFigure 1; Figure 3 is a similar view, looking from the left hand side ofthe machine; Figure 4 is a view on a slightly enlarged scale of some ofthe parts shown in Figure 3, and with the control connections shown inoperating positions; Figure 5 is a detail view of some of theconnections, taken on the line 55 of Figure 4; Figure 6 is a view inrear elevation, partly in section of the machine; Figure '7 is a view infront elevation on an enlarged scale of a portion of the machineincluding the main and auxiliary take-ups; Figure 8 is a view of thesame parts shown in positions somewhat laterin a sewing cycle than thepositions indicated in Figure 7; Figure 9 is a similar view of the partsas shown in Figures 7 and 8 showing thepositions assumed when themachineis stopped by failure of tension on the thread; Figure 10 is aview, partly in section of the parts shown in Figure 9, looking from theleft hand side of the machine; Figure 11 is a detail sectional view,taken along the line i l--l I of Figure 9; Figure 12 is a detail view ofthe auxiliary take-up and some of the actuating mechanisms connectedtherewith, shown in section taken along the line l2l 2 of Figure 1; andFigure 13 is a sectional view taken on the line |3|3 of Figure 4.

Except as hereinafter described, the various parts of the machineillustrated in the drawings are constructed and arranged to operate asin the lockstitch shoe sewing machine of inventors patent above referredto. The machine is provided with stitch-forming devices including a.curved hooked needle 2, a curved awl 4, a shuttle 5, a work support 6, apresser-foot I, a main takeup 8 and a tension wheel 10. The stitchforming devices are actuated from a main sewing cam shaft l2 throughconnections which are the same as those embodied in the machine ofinventors patent above referred to, and will not be particularlydescribed herein. Within the shuttle is a supply of locking thread, oneend of which is indicated at l4, and the needle thread l6 passes fromthe tension wheel l0 around pulleys I8, 20 and 22 to the main take-up 8before reaching the work. Between the pulleys 20 and 22 the threadpasses over an auxiliary I take-up 24 loosely mounted on a stud bolt 25which also supports the pulley 22 for rotation. The thread passes underthe pulley 22, over the auxiliary take-up and under the pulley 20 sothat the auxiliary take-up tends to hold thread yieldingly at one sideof its normal path between the two pulleys except when a stitch is beingset, at which time the auxiliary take-up yields up thread as shown inFigure 8.

The driving and stopping mechanisms are the same as in the machine ofinventors Patent No. 2,078,942 of May 4, 1937, and comprise a high speedtreadle controlled clutch 26 (Figs. 1 and 2) for driving the sewingshaft, and an automatically controlled reversely driven low speedclutch, the driver of which is indicated at 28 and the driven member at29. In stopping the machine the low speed clutch is first actuated andthen rendered inoperative when the needle and awl are clear of the work,and a timing cam 30 is provided for this purpose. A cam lever 32 isvibrated by the cam 30 while the machine is in operation, and the leveris locked against movement when the machine is to be stopped. To startthe machine in operation, the main driving clutch 26 is engaged throughthe action of a forked arm 34 connected at its upper end with the clutchand secured to a rock shaft 36 having an arm 38 to which the upper endof a vertical rod 40 is secured. The rod 40 is slidable in a perforatedblock 42 pivotally mounted on an arm 44 connected to one end of a shaft46. The other end of the shaft 46 has an arm 48 to which the upper endof a treadle rod 50 is pivotally connected, and the lower end of the rodis connected to a foot treadle 52. When the treadle is depressed, aspring ii on the rod 40 is compressed against a check nut on the rod 40by downward movement of the block 42, and the clutch 26 is engaged. Whenthe treadle is released, the clutch 26 is disengaged by means includingsprings 53 and 54 connected to the arm 44 and the arm 38, respectively.The arm 44 is provided with a hook shaped cam surface engaged by a rollon a lever 56 having an upstanding forked arm embracing a spool-likemember at the end of a lock bolt 58, so arranged that when the treadleis depressed to start the machine, the lock bolt 58 will be withdrawnfrom an opening in the lower end of the cam lever 32 and when thetreadle is released, the lock bolt will be allowed to engage and lockthe lever 32. The parts so far described and the other stitch formingdevices with their actuating mechanisms are the same as in the machineof inventors application.

In the machine illustrating the embodiment of the invention, means areprovided for disconnecting the treadle from the driving and stoppingmechanisms whenever the tension on the sewing thread fails to draw theauxiliary take-up 24 to one side from its retracted position (Fig. 7) sothat the machine will automatically be brought to rest. To urge theauxiliary take-up yieldingly towards its retracted position duringsewing, the hub of the auxiliary take-up is surrounded by a coil spring60, one end of which is held by a forwardly bent stop arm 62, and theother end of which is hooked around the auxiliary take-up arm (see Fig.12). To limit the taking up movement of the auxiliary take-up, theauxiliary take-up arm carries a perforated plate 64 surrounding its huband having a forwardly bent finger 86 arranged to cooperate with thestop arm 62 when the auxiliary take-up is retracted by the spring 60.The plate 64 is provided with a slotted porstitch is being set (Fig.

tion through which passes a screw 68 threaded into the auxiliary take-uparm, so that the retracted position may be adjusted. When the finger 66attached to the auxiliary take-up rests against the arm 62 duringsewing, the forwardly bent portion of the finger lies in the path of areciprocating rod I8 guided within a sleeve-like passage formed in athreaded bar 12 attached to the machine frame. The upper end of the rodI8 is pivotally connected to one arm of a lever 14 fulcrumed on a screwstud I6 which in turn is threaded to one end of an arm I8 fixed to arock shaft 88 (seev Fig. 12) extending rearwardly of the machine. Thelever I4 is oscillated on the stud I6 during each sewing cycle of themachine by connections including a link 8I, as will be more fullydescribed hereinafter, just as each stitch is set, so as to project therod 18 into the path of the finger 66. During normal sewing operations,movements of the auxiliary take-up by the thread draws the finger 66yieldingly out of the way of the reciprocating rod 18, while each 8). Atthis time the maximum tension is being applied to the needle thread andif looseness occurs in the thread, the thread will fail to cause theauxiliary take-up to yield so that the rod 18 will engage the finger 66and the rod will be held from reciprocating movement as shown in Fig. 9.When this occurs, the oscillation of the lever 14 about the screw stud16 is stopped and the stud and the arm I8 are raised upwardly about theshaft 88 as a center, causing the shaft to be rotated. The rearward endof the shaft 88 carries an arm 82 (see Figs. 4 and 6) connected withlatch means for disconnecting the treadle rod and the .driving andstopping mechanisms.

The latch means for disconnecting the treadle from the driving andstopping mechanisms is best shown in Figs. 4, 5, and 11. Referring tothese figures, the arm 48 to which the upper end of the treadle rod 58is connected, is loose on the shaft 46, and at the end of the shaftthere is a short arm 84, the free end of which is provided with ashoulder cooperating with a latch lever 86 see cured to a pin 88rotatable in a lug on the arm 48, the pin serving as a fulcrum for thelever 86.

The latch lever 86 is ordinarily held in alignment with and directlyabove the shoulder on the arm 84, as shown in Fig. 4, by a spring 98stretched between a pin on the latch lever 86 which extends through aslot in the arm 48 and a dog 92 pivotally mounted on the arm 48. In

this position of the latch lever, the arm 48, which is connected withthe treadle and the arm 84 which is secured to the shaft 46 act togetherto control the driving and stopping mechanisms.

. However, when the reciprocating rod 18 engages the finger 66, asindicated in Fig. 9, the shaft 88 being rotated, a vertical link 94connected at its upper end with the arm 82 on the shaft 88 causes oneend of the dog 92 to engage an arm 96 on the pin 88 which supports thelatch lever, thus causing the latch lever to move out of alignment withthe end of the arm 84, as shown in Fig. 10. In this position of thelatch lever the arm 84 is disconnected from the arm 48 so that thesprings 53 and 54 cause the driving and stopping mechanisms to bring themachine to rest. To actuate the dog 92 against the arm 96 the lower endof the link 94 is provided with a pin 98 engaging one end of the dog 92.The link 94 has a slot I82 at its lower end through which passes a screwI88 so that the link may move relatively to the arm 48. The link 94 isalso formed with frame and a shoulder-on the link.

When the machine has been brought to rest after disconnect on of thetreadle controlling connections, the connections will not be reset untilthe treadle is released. The timing of the machine is such that afterthe reciprocating rod 18 has been projected against the finger 66 .tostop the machine, it will be withdrawn from the finger during the finalmovements of the machine by the driving and stopping mechanisms so thatthe link 94 will be again lowered and the latch lever 86 permitted toengage the arm 84. This engagement of the latch lever with the arm 84occurs, however, after the arm has been moved above the lowerend of thelatch lever as shown in Fig. 10, so that the parts are re-latched onlyafter the arm 48 and the treadle have been released. If the cause ofslack thread has been removed when the treadle is again depressed afterbeing released, the machine will operate in the usual way, but if thedifiiculty has not been removed the machine will again be brought torest in the manner just outlined after the completion of a single sewingcycle of operation.

To reciprocate the rod 18 towards and from the path of the finger 66,the link 8| is connected at its uppermost end to an arm II8 formedintegrally with the forward end of a shaft II2 parallel to the shaft 88.At the rearward end of the shaft I I2 is an arm II4 connected to thelower end of a link I I6, having at' its upper end a slotted block II8(see Figs. 3 and 4) .forming a universal a gear segment on a cam leverI24 which corre-' sponds with the cam lever 41 cation. The cam lever ona shaft in a cam on the main sewing shaft I2. Cam slot I28 is so shapedthat the rod 18 will reciprocate into and from the path of the finger 66on the auxiliary take-up arm 24 at a time in each sewing cycle that thestitch is being set by the main take-up.

The machine is also provided with a thread cutter constructed in amanner more fully described in inventors Patent No. 2,148,197, andactuated across the path of the needle and awl against the work while onthe work support 6. The knife I38 of the cutter is supported on an armI32 secured at the end of a vertical shaft I34. The shaft I34 is given arotary and reciprocating motion towards and from the work to impart ahelical stroke to the knife I38, cutting the threads of the last stitchby penetrating the upper surface of the work as described in theapplication. To actuate the knife, the shaft 134 is connected to avertical rack I36 (see Fig. 2)

of the prior appli- I 24 is fulcrumed loosely meshing with a segment I38on a horizontal shaft within which is astud I58 on an actuating camlever I52 pivoted at its lower end on a bolt I54 and provided with afollower I 56 engaging a I26 and is actuated by a cam slot I 28 slot inan actuating cam I 581 loose on a continuously rotating auxiliary shaftI58 at the rear of the main sewing shaft, the cam being driven onerevolution to actuate the cutter when the machine stops.

To cause the cam I58 to be rotated one revolution when the sewing shaftsubstantially reaches a position with the needle and awl disengaged fromthe work as the machine stops, there is a one-revolution roller-typeclutch I82 (see Fig. 2) connected to the cam which is held inactiveduring sewing by a pawl I84 rotatably mounted on a shaft I 88 to movetowards and from engagement with an abutment on the clutch. To withdrawthe pawl I84 from the abutment at the end of a seam so that the cam willbe rotated, the shaft I88 also loosely supports a dog I88, two fingerportions of which cooperate with a roll I18 when the sewing shaft I2 isreversely rotated by the low speed driving clutch, and the dog I88imparts a rotary movement in the proper direction to withdraw the pawlI84 just as the machine comes to rest.

If the machine of Patent No. 2,148,197 is brought to rest, for anyreason before the end of a seam to be completed is reached, the threadcutter will be actuated to sever the threads unless special adjustmentis made, as hereinafter de scribed, and an unnecessary cut will be madein the surface of the work. When the machine is again started there willbe a break in the line of stitching and an injury to the appearance ofthe work.

To avoid this difliculty, the prior machine is equipped with a manualmeans including a control handle I12, arranged when set in properadjusted position to prevent operation of the thread cutter. The handleI12 is pivoted on the frame of the machine and is connected by means ofa link I14 to an arm I18 secured to the outer end of a shaft I18. To theinner end of the shaft I18 is fixed an arm I88 (see Fig. 6) having a pinI82 sliding loosely in the slotted lower end of a link I84, theupper endof which is pivotally connected to the rearward end of the link I48 ofthe cutter actuating connections. When the rearward end of the link I48is held in lowered position the vertical part of the L-shaped slot I48engages the stud I58 on the lever I52, so that the cutter will beactuated when the lever I52 is moved. To hold the cutter actuating linkI48 in lowered position, the link I84 is connected to one end of atension spring I88, the other end of which is connected to the machineframe. When the handle is moved rearwardly, the cutter actuating linkI48 is raised until the stud I58 engages the horizontal part of the slotso that the cutter will not be actuated when the cam lever I52 is movedby the cam I58.

If the operator wishes to insure that the cutter of the machinedisclosed in the application will not operate in case the machine isstopped suddenly before the end of a seam is reached, the handle I12 maybe kept in the rearwardly adjusted position until just before the seamis completed. In order to cause the cutter to be actuated, under thesecircumstances at the end of a scam, the handle I12 must be drawnforwardly simultaneously with, or just before, release of the treadle.Otherwise the cutter will not he actuated until the machine is againrestarted and stopped. This movement of the handle I12 requires an extramanipulation which is ordinarily of greater inconvenience than that ofseverin the threads with a hand knife at the end of a seam in the usualway.

As has been stated, the thread cutter in the present machine is heldfrom operation if the machine is stopped by reason of automaticallydisconnecting the treadle from the driving and stopping mechanisms. Tohold the thread cutter inoperative when the machine is thus stopped,connections are provided for preventing operation of the cutter when thetreadle is held depressed. The cutter actuating cam I58 being caused torotate only when the machine is stopped, the cutter can only be operatedwhen the machine is stopped by release of the treadle in the usual way,and no cutting will occur if the machine is stopped when the treadle isreleased after stopping.

The connections for preventing operation of the cutter act upon theslotted end of the cutter actuating link I48 and are so arranged thatwhen the treadle is depressed, the horizontal portion of the L-shapedslot I48 engages the stud I58 whether the handle I12 is in its rearwardposition or not. To permit the cutter actuating link I48 tobe raised tothis position when the treadle is depressed, the lower slotted end oflink I84 cooperates with a pin I88 (see Fig. 13) mounted on an arm I98secured to the inner end of a shaft I92. The shaft I92 is rotatable inbearings alined with the bearings for shaft I18 so that pin I88 moves inthe same are as the pin I82. The pin I88 enters only partway into theslotted end of the link I84 so as not to interfere with the pin I82, theslot in the link I84 being long enough to permit the link I84 to be heldin raised position by either of the pins I82 and I88 regardless of theposition of the other. The shaft I92 has secured to its outer end an armI94 (see Figs. 3, 4 and 6) connected to the treadle actuated arm 48 by alink I98. When the machine is stopped by disconnecting the treadle fromthe driving and stopping mechanisms, the arm 48 is held in loweredposition and the arm 84 only, which is secured to the shaft 48, isreleased.

The cam 38 for actuating the low speed driving clutch is so shaped thatthe machine is brought to rest after being reversely rotated with themain take-up 8 near the end of its taking up stroke, but spaced a shortdistance from the extreme limit of its taking up movement. When the workis withdrawn from the machine of the application after the operation ofthe thread cutter, the thread will adhere somewhat to the work so thatthe end of thread may be withdrawn with the work a short distance fromthe work support and a length of thread equal to the amount required bythe take-up in completing its taking up stroke is drawn over the edge ofthe work support. When a new work piece is inserted in the machine andclamped by the presser-foot, the thread will also be clamped so that itwill not be drawn back into the machine during the first stitch of a newseam. The amount of thread left on the work support, therefore, iswasted, being made up by an additional amount drawn from the supply whenthe machine is started. To prevent a length of thread being withdrawnfrom the present machine after stopping, equal to the amount required bythe take-up in completing its taking up stroke, the auxiliary take-up 24is actuated when the machine stops, in the present machine, to take upand hold yieldingly an amount of thread and to give up thread when themachine is restarted so that thread will be retained in the machine foruse in completing the first stitch of a new seam without furtherwithdrawal from the supply.

To actuate the auxiliary take-up 24 at the end of a seam so that anextra length of thread will be held yieldingly within the machine whilestopped for use in the first stitch of the new seam, connections areprovided between the auxiliary take-up and the driving and stoppingmechanism for changin the position of the stop arm 62. When the machineis running. the arm 62 is held in the position shown in Figures 7 to 9,so as to give the auxiliary take-up a limited range of movement, andwhen the machine is stopped the stop arm is lowered to the position ofFigure l to increase the range of movement of the auxiliary take-up. Thestop arm 62 is connected to a hub I98 (see Fig. 12) surrounding the bolt25. The hub I 98 also has extending from it an arm 200 pivotallyconnected to one end of a link 202, the other end 'of which is pivotallyconnected to an arm 20! secured to the forward end of a sleeve 206surrounding the shaft 80 and having hearings in the machine frame. Thesleeve 206 also has secured to its central portion an arm 200 pivotallyconnected to a slotted block 2I0 having a pivotal connection with a link2I2 connected to a block 2 (see Fig. 4) similar to the block 2I0. Theblock 2 is pivotally connected with an arm 2I6, the arrangementproviding for universal movement between the arm 2I6, the link 2I2 andthe arm 208. The arm 2I6 is secured to the shaft I66 and to rock theshaft when the machine is stopped, the connections include a lever 2I8secured to the shaft I66, a link 220 connected at its upper end to anarm of the lever ZI8 and at its lower end to an arm 222, a sleeve 224(see Fig. 6) to which the am 222 is fixed, and the lever 56 which isalso secured to the sleeve 22!. When the lock bolt 58 enters the openingin lever 32 to bring the machine to rest, the lever 56 rocks the shaftI66 and the connections described cause the stop arm 62 to be moved tothe position of Figure 1, so that the spring 60, which actuates theauxiliary take-up, may rotate the auxiliary take-up further in acounterclockwise direction than occurs during sewing, thus yieldinglytaking up an extra supply of thread. The extra supply taken up isadjusted to provide thread for the main take-up in restarting themachine. When the machine is restarted these connections return the stoparm 62 to the position of Figures 7 to 9 so that the extra supply isgiven up. If the thread cutter has been actuated when the machine isstopped, the end of thread in the first stitch of a new seam formed whenthe machine is restarted will be close to the work and will require notrimming. If the cutter is not operated, the yielding action of theauxiliary take-up will permit the work to be manipulated to a limitedextent in order to relocate the work properly with respect to the stitchforming devices, and the seam may be continued without break in thethread or other irregularity.

The nature and scope of the invention having been indicated, and amachine embodying the features of the invention having been specificallydescribed, what is claimed is:

l. A sewing machine having, in combination, stitch forming devices,driving and stopping mechanisms, means comprising a treadle and suitableconnections for maintaining the driving and stopping mechanisms underthe constant control of the operator during sewing to actuate and tostop the stitch forming devices at vill, means acting automatically torender said connections ineffective to maintain continued actuation ofthe stitch forming devices when said devices operate improperly, andmeans for causing the stopping mechanism to stop the stitch formingdevices when said connections are rendered ineffective.

2. A sewing machine having, in combination, stitch forming devices,driving and stopping mechanisms, means comprising a treadle and.

suitable connections for maintaining the driving and stopping mechanismsunder the constant control of the operator during sewing to actuate andto stop the stitch forming devices at will, means acting upon failure ofthread tension during a stitch forming cycle to render said connectionsinefiective to maintain continued actuation of the stitch formingdevices, and means for. causing the stopping mechanism to stop thestitch forming devices when said connections are rendered ineflective.

3. A sewing machine having, in combination, stitch forming devices,driving and stopping mechanisms, means comprising a treadle and suitableconnections for maintaining the driving and stopping mechanisms underthe constant control of the operator during sewing to actuate and tostop the stitch forming devices at will, and means acting automaticallyand independently of treadle movement upon failure of thread tensionduring a stitch forming cycle to cause the stoppiing mechanism to stopthe stitch forming dev ces.

4. A sewing machine having, in combination, stitch forming devices, amain take-up, and a yieldingly actuated auxiliary take-up, driving andstopping mechanisms, means comprising a treadle and suitable connectionsfor maintaining the driving and stopping mechanisms under the constantcontrol of the operator during sewing to actuate and to stop the stitchforming devices at will, means connected to the auxiliary take-up fordisconnecting the treadle from the driving and stopping mechanisms whenthe tension on the thread passing over the auxiliary take-up fails, andmeans for causing the stoppingmechanism to stop the stitch formingdevices when the treadle is disconnected. I

5. A sewing machine having, in combination, stitch forming devices,driving and stopping mechanisms, means comprising a treadle and suitableconnections for maintaining the driving and stopping mechanisms underthe constant control of the operator during sewing stop the stitchforming devices at will, a thread cutter, and means for preventingactuation of the thread cutter when the treadle is held in a position tocause the stitch forming devices to be actuated.

6. A sewing machine having, in combination, stitch forming devices,driving and stopping mechanisms, means comprising a treadle and suitableconnections for maintaining the driving and stopping mechanisms underthe constant control of the operator during sewing to actuate and tostop the stitch forming devices at will, means acting automatically uponan improper operation of the stitch forming devices to cause thestopping mechanism to stop the stitch forming devices, a thread cutter,mechanism for actuating the thread cutter upon stopping of the stitchforming devices by manipulation of the treadle by the operator, andmeans for preventing actuation of the thread cutter upon stopping of thestitch forming devices by reason of an improper operation of saiddevices.

to actuate and to '7. A sewing machine having, in combination, stitchforming devices, driving and stopping mechanisms, a thread cutter, powerdriven mechanism for actuating the thread cutter, means comprising atreadle and suitable connections for maintaining the driving andstopping mechanisms under the constant control of the operator duringsewing to actuate and to stop the stitch forming devices at will, andtreadle actuated connections for causing the thread cutter to bedisconnected from its actuating mechanism when the treadle is depressedand to be reconnected to its actuating mechanism when the treadle isreleased.

8. A sewing machine having, in combination, stitch forming devices,driving and stopping mechanisms, a thread cutter, power driven mechanismfor actuating the thread cutter, means comprising a treadle and suitableconnections for maintaining the driving and stopping mechanisms underthe constant control of the operator during sewing to actuate and tostop the stitch forming devices at will, means acting automatically uponan improper operation of the stitch forming devices to render thetreadle ineffective to maintain continued actuation of the stitchforming devices, means for causing the stopping mechanism to stop thestitch forming devices when the treadle is rendered ineffective, andtreadle actuated connections for preventing actuation of the threadcutter upon stopping of the stitch forming devices by reason of animproper operation of said devices.

9. A sewing .machine having, in combination, stitch forming devices,driving and stopping mechanisms, a treadle for controlling the drivingand stopping mechanisms, a thread cutter, power driven mechanism throwninto operation by the driving and stopping mechanisms in stopping themachine to actuate the thread cutter, means for rendering the drivingand stopping mechanisms effective to stop the machine when the stitchforming devices operate improperly, and means for preventing operationof the thread cutter when the treadle is held in a position to cause thestitch forming devices to be actuated.

10. A sewing machine having, in combination, stitch forming devices, amain sewing shaft for actuating said devices, driving and stoppingmechanisms, means comprising a treadle and suitable connections formaintaining the driving and stopping mechanisms under the constantcontrol of the operator during sewing to actuate and to stop the stitchforming devices at will, a thread cutter, power driven mechanism throwninto operation when the sewing shaft reaches a predetermined position instopping the machine, connections between the cutter and the powerdriven mechanism for actuating the cutter, and

connections between the treadle and the cutter actuating connections forrendering the cutter inoperative when the treadle is in a position tocause the stitch forming devices to be actuated.

11. A sewing machine having, in combination, stitch forming devices, amain sewing shaft for actuating said devices, driving and stoppingmechanisms, means comprising a treadle and suitable connections formaintaining the driving and stopping mechanisms under the constantcontrol of the operator during sewing to actuate and to stop the stitchforming devices at will, a thread cutter, power driven mechanism throwninto operation when the sewing shaft reaches a predetermined position instopping the machine, connections between the cutter and the powerdriven mechanism for actuating the cutter, connections between thetreadle and the cutter actuating connections for rendering the cutterinoperative when the treadle is in a position to cause the stitchforming devices to be actuated, and means for rendering continuedpressure on the treadle ineifective to maintain continued actuation ofthe stitch forming devices when said devices operate improperly.

12. A sewing machine having, in combination, stitch forming devicesincluding a main take-up, a yielding auxiliary take-up, a reciprocatingmember operated once during each sewing cycle of the machine, means forholding said member from reciprocating when the thread fails to causethe auxiliary take-up to yield, connections to said member for bringingthe machine to rest when the member is held from reciprocating, a stopfor limiting the movement of the auxiliary takeup during sewing, andmeans for moving the stop when the machine is being brought to rest toincrease the yielding movement of the auxiliary take-up in a directionto take up thread.

13. A sewing machine having, in combination, stitch forming devicesincluding a main take-up, an auxiliary take-up operating yieldinglythrough a limited range of movement to maintain tension on the thread,driving and stopping mechanisms for bringing the machine to rest, a stopfor limiting the range of movement of the auxiliary takeup duringsewing, and means for moving the stop to permit the auxiliary take-up toincrease its range of movement in a direction to take-up an extra supplyof thread when the machine is being brought to rest.

14. A sewing machine having, in combination, stitch forming devicesincluding a main take-up, an auxiliary take-up operating yieldinglythrough a limited range of movement to maintain tension "on the thread,driving and stopping mechanism for bringing the machine to rest, withthe main take-up near the end of its taking up stroke, a stop forlimiting the range of movement of the auxiliary take-up during sewing,and means for moving the stop asthe machine comes to rest to increasethe range of movement of the auxiliary take-up to take up an amount ofthread equal to that required by the main take-up in completing itstaking up stroke as the machine is restarted.

15. A sewing machine having, in combination, stitch forming devices, amain sewing shaft for actuating said devices, driving and stoppingmechanisms, means comprising a treadle and suitable connections formaintaining the driving and stopping mechanisms under the constantcontrol of the operator during sewing to actuate and to stop the stitchforming devices at will, a thread cutter, power driven mechanism throwninto operation when the sewing shaft reaches a predetermined position instopping the machine, connections between the cutter and the powerdriven mechanism for actuating the cutter, connections between thetreadle and the cutter actuating connections for rendering the cutterinoperative when the treadle is in a position to cause the stitchforming devices to be actuated, and manual means for preventingoperation of the cutter in any position of the treadle.

16. A sewing machine having, in combination, stitch forming devices, amain sewing shaft for actuating said devices, driving and stoppingmechanisms, means comprising a treadle and suitable connections formaintaining the driving and stopping mechanisms under the constantcontrol of the operator during sewing to actuate and to stop the stitchforming devices at will, a thread cutter acting at the end of a seamtosever the thread close to the surface of the work in the machine,means for preventing actuation of the thread cutter at certain timeswhen the machine is brought to rest, and yielding means for holdingyieldingly a length of thread within the machine after stopping and forgiving up said length of thread when the machine is started.

17. A sewing machine having, in combination, stitch forming devices, amain sewing shaft for actuating said devices, driving and stoppingmechanisms, means comprising a treadle and suitable connections formaintaining the driving and stopping mechanisms under the constantcontrol of the operator during sewing to actuate and to stop the stitchforming devices at will, means for yieldingly taking up a length ofthread at the end of a seam, and means actuated upon restarting themachine for causing the said length of thread to be given up.

18. A sewing machine having, in combination, stitch forming devices, amain driving shaft for actuating said devices, driving and stoppingmechanisms for bringing the shaft to rest at a predetermined angularposition, a treadle for causing the driving and stopping mechanisms toactuate and stop the shaft, a thread cutter, power driven mechanismthrown into operation by the main shaft in coming to rest, connectionsbetween the cutter and the power driven mechanism for actuating thecutter, means for disconnecting the cutter actuating connections whenthe treadle is depressed, and means for causing the driving and stoppingmechanisms to stop the main shaft while the treadle is depressed.

19. A sewing machine having, in combination, stitch forming devicesincluding a main take-up, a yielding auxiliary take-up, a reciprocatingmember operated once during each sewing cycle of the machine, a fingeractuated by the auxiliary takeup arranged to be engaged by thereciprocating member when the tension on the thread fails, means forbringing the machine to rest when the reciprocaating member engages thefinger, a stop to hold the auxiliary take-up at a position in which saidmember will engage the finger, and means for moving the stop when themachine is brought to rest to permit the auxiliary take-up to move in adirection to take up thread past the position in which said member willengage the finger.

20. A sewing machine having, in combination, stitch forming devicesincluding a main take-up, a yielding auxiliary take-up, a reciprocatingmember operated once during each sewing cycle of the machine, a fingeractuated by the auxiliary take-up arranged to be engaged by thereciprocating member when the tension on the thread fails, driving andstopping mechanisms, means for causing the driving and stoppingmechanisms to bring the machine to rest when the reciprocating memberengages the finger, a stop for the auxil- 'iary take-up arranged to holdthe auxiliary takeup at a position in which said member will engage thefinger, and connections between the stop and the driving and stoppingfor moving the stop when the machine is brought to rest to permit theauxiliary take-up to move in a direction to take up thread past theposition in which said member will engage the finger.

21. A sewing machine having, in combination, stitch forming devices, amain take-up, and a yieldingly actuated auxiliary take-up, driving andstopping mechanisms, a manually operated treadle for causing the drivingand stopping mechanisms to actuate the stitch forming devices when thetreadle is depressed, and means for disconnecting the treadle from thedriving and stopping mechanisms durlng operation of the stitch formingdevices when the tension on the thread passing over the auxiliarytake-up fails, and thereafter for maintaining the treadle connected tothe driving and stopping mechanisms for at least a single sewing cycleof the stitch forming devices after the treadle is released and againdepressed, regardless of the tension on the thread.

22. A sewing machine having, in combination, stitch forming devicesincluding a main take-up, an auxiliary take-up operating yieldinglythrough a limited range of movement to maintain tension on the thread,driving and stopping mechanisms comprising a high speed drivingmechanism and a low speed driving mechanism having a vibrating lever anda lock bolt for engaging the vibrating lever after the machine is drivenby high speed driving mechanism to bring the low speed mechanism intooperation and the machine to rest, a stop for limiting the range ofmovement of the auxiliary take-up during sewing, and a connection actingwhen the lock bolt is brought into cooperative relation with thevibrating lever for moving the stop to permit the auxiliary takeup toincrease its range of movement in a direction totake up an extra supplyof thread when. the machine is being brought to rest.

23. A sewing machine having, in combination,

. stitch forming devices, a cam shaft, driving and stopping mechanismsfor said shaft, means comprising a treadle and suitable connections formaintaining the driving and stopping mechanisms under the constantcontrol of the operator during sewing to actuate and to stop the stitchforming devices at will, and means actuated from the cam shaft, uponfailure of thread tension during a stitch forming cycle, to render saidconnections ineffective and cause the stopping mechanism to stop thestitch forming devices.

24. A sewing machine having, in combination, stitch forming devices, acam shaft, driving and stopping mechanisms for said shaft, means com,-prising a treadle and suitable connections for maintainingthe drivingand stopping mechanisms under the constant control of the operatorduring sewing to actuate and to stop the stitch forming devices at will,means actuated from the cam shaft when said devices operate improperlyto render said connections ineffective to maintain continued actuationof the stitch-forming devices and cause the stopping mechanism to stopthe stitch-forming devices.

O'I'IO R. HAAS.

